Maintenance and Service   
11.1 Removing and Installing Hardware Components 
  SIMATIC IPC427C 
68  Operating Instructions, 04/2009, A5E02414743-01 
Tools 
●  Torx T8 (cover and upper sheet metal cover) 
●  Torx T10 (hard disk mounting) 
●  Torx T20 (Protective earth terminal)   
●  Hexagon head 5mm (spacing bolts PC/104)  
11.1.2  Preventive maintenance 
 
To maintain high system availability, we recommend the preventative exchange of those PC 
components that are subject to wear. The table below indicates the intervals for this 
exchange. 
 
Component  Exchange interval: 
Hard disk  3 years 
CMOS backup battery  5 years